roberts



A(No Model.)

T.. o. ROBERTS.

` ELBVATOR SAFETY STOP. No. 360,488. y Patented Apr. 5, 1887.

-Ffkf- WITNBSSES: gul/44 lll ATTORNEYS N. PETERS, Pima-Limgmphu, wminglm 92o UNITED STATES PATENT OFFICE.

FREDERICK C. ROBERTS, OF MOIIAVK, NEW YORK, ASSIGNOR OF ONE-HALF TO DANIEL P. VAN COURT, OF SAME PLACE.

ELEVATOR SAFETY-STO P.

SPECIFICATION forming part of Letters Patent No. 360,483. dated April 5, 1887.

Application led January 10, 1887. Serial No. 223,976. (No model.)

Z'o all whom it may concern:

Be it known that I, FREDERICK C. ROBERTS, of Mohawk, in the county of Herkimer, in the State of New York, have invented new and useful Improvements in Elevator Safety-Stops, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

This invention relates to safety-stops de- Io signed to arrest the descent of the elevatorcar in case of accidental disrupture of the elevating-cable or breakage of the elevating mechanism.

The invention consists in an improved and a more secure attachment of the safety-stop to the elevatorecar, as hereinafter more fully explained, and specitically set forth in the claim.

In the annexed drawings, Figures land 2 are respectively front and side elevations of an 2o elevator-car and adjacent portions of the guiderails embodying my invention.

A represents the wooden car-frame, which may be of any suitable construction. To the exterior of the sides of said frame I rigidly secure metallic plates P P, which are united or formed in one piece with a plate, P', extended across the top of the car-frame, as shown in Fig. l of the drawings, said plates serving to impart the requisite stability to the 3o car-frame.

Underneath the top plate,P, is the lift-beam B, extended across the car and projecting with its ends through the frame and through ver,- tical slots a t in the metallic plates P P.'

D denotes the lifting-cable, by which the car is suspended, and s is a spring interposed between the top plate, P, audlift-beam B, to relieve the cableA and car from jars when starting and stopping the car.

4o R R represent the stationary vertical guiderails at opposite sides of the car, and b bare guides secured to the metallic plates P P at the front and rear of the guide-rails R R, the car being thereby guided in its movements.

C C and C O represent two sets of clutcharms, pivoted intermediate their length on the outer sides ofthe platesP P, and arranged with the clutch-arms of each set at opposite sides of the guide-rails R R, one of said sets 5o of clutch-arms being connected to the plate P some distance above the center of the height of the car and constituting the main clutch! arms, and the other set being connected to the lower part of the plate P, and serving as auxiliary or supplemental safety-clutch arms, the 5 5 inner ends of said arms being provided with serrated faces, by which they are adapted to grip between them the guide rail R, as illustrated by full lines in Fig. 2 of the drawings.

To each of the protruding ends of the lift- 6o beam B is firmly secured a plate, c, from which project trunnions 't t, and on these trunnions are hung the levers Z Z, which are pivoted to the outer ends of the main clutcharms O C, some distance from the lower extremities of the said levers. To the said extremities of the levers Z Z are connected the upper ends of rods r r, the lower ends of which are connected to the outer ends of the auxiliary or supplemental safetyclutch arms O C'. 70

The effect of the described clutch-arms and their connection with the lift-beam B is that in case of accidental disrupture of the Acable D the lift-beam, with the levers Z Zand rods i' o', drops and throws the clutcharms into en- 75 gagement with the guiderails R R, and there` by arrests the descent of the car, thus preventing serions results from such accidents.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, 8o

In combination with the guide-rails R R and car-frame A, the metallic plates P P, secured to opposite sides of-the carframeand united with the cross-plate P at the top and pro` vided with the slots a in the sides, the liftbeam B, projecting through said slots, the spring s, interposed between the lift-beam and cross-plate P', the clutcharms O O and C O', pivoted intermediate their lengths on the 9o plates P P at opposite sides ofthe guide-rails R, the levers Z Z, hung on the ends of the liftbeam and connected to the outer ends of the clutch-arms O O, and the rods r o', connecting the lower ends of the levers Z Z with the outer ends of the clutch-arms O O', all constructed and combined substantially in the manner specified and shown.

In testimony whereof I haveliereunto signed my name and aiiixed my seal, in the presence Ioo of two attesting witnesses, at Herkimer, in the county of Herkimer, in the State of New York, this 13th day of December, 1886.

FREDERICK o. RoBERTs. [n s] Witnesses.

FRANcIs E. EAsToN, GEO. F. SMALL. 

